1. Instituto de Parasitologia y Biomedicina Lopez-Neyra, CSIC, Granada, Spain,
2. Department of Rheumatology, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands,
3. Servicio de Medicina Interna, Hospital Valle de Hebron, Barcelona, Spain,
4. Department of Medical Genetics, University Medical Center Utrecht, Utrecht, The Netherlands,
5. Servicio de Reumatología, Hospital Clínico San Carlos, Madrid, Spain,
6. Servicio de Reumatología, Hospital La Princesa, Madrid, Spain,
7. Servicio de Medicina Interna, Hospital Clínico Universitario, Granada, Spain,
8. Servicio de Reumatología, Hospital Marqués de Valdecilla, Santander, Spain,
9. Servicio de Medicina Interna, Hospital Virgen del Rocio, Sevilla, Spain,
10. Servicio de Reumatología, Hospital Ramón y Cajal, Madrid, Spain,
11. Hospital 12 de Octubre, Madrid, Spain,
12. VU University Medical Center, Amsterdam, The Netherlands,
13. Department of Rheumatology, University of Leiden, Leiden, The Netherlands,
14. Department of Dermatology, Josefs-Hospital, Ruhr University Bochum, Bochum, Germany,
15. Hannover Medical School, Hannover, Germany,
16. Department of Rheumatology and Clinical Immunology, Charité University Hospital, Berlin, Germany,
17. Rheumatology Unitand Chair, Spedali Civili, Università de gli Studi, Brescia, Italy,
18. Referral Center for Systemic Autoimmune Diseases, Fondazione IRCCS Ca'Granda Ospedale MaRepiore Policlinico and University of Milan, Milan, Italy,
19. Department of Medicine, Policlinico GB Rossi, University of Verona, Verona, Italy,
20. Department of Dermatology, University of Cologne, Cologne, Germany,
21. Department of Internal Medicine 3, Institute for Clinical Immunology, University of Erlangen-Nuremberg, Erlangen 91054, Germany,
22. Institute of Cellular Medicine, Newcastle University, Newcastle Upon Tyne, UK,
23. Centre for Rheumatic Diseases, Glasgow Royal Infirmary, Glasgow, UK,
24. Department of Rheumatology and Epidemiology, University of Manchester, Manchester Academic Health Science Centre, Manchester, UK,
25. Centre for Rheumatology, Royal Free and University College School, London, UK and
26. The University of Texas Health Science Center–Houston, Houston, TX, USA